[PATCH] Fix synaptics driver for PowerPro C 3:16

[Peter Osterlund]

Hi!

A user reported that the synaptics touchpad driver didn't work on his
PowerPro C 3:16 laptop. Some debugging revealed that the patch below
is necessary to make the driver compatible with his touchpad.

For some reason bit 3 in byte 1 and 4 in the synaptics packets are set
to 1, which fails because the driver follows the documentation which
says that the bit is 0.

Hardware properties: (reported by synclient -h)
     Model Id     = 009d48b1
     Capabilities = 00904713
     Identity     = 00084715

With this patch, the touchpad works as expected. As far as I can see,
this patch can not break anything for other touchpads, so it should be
safe. Does anyone see a problem with this patch?

--- linux/drivers/input/mouse/synaptics.c.old	2003-11-11 20:41:15.000000000 +0100
+++ linux/drivers/input/mouse/synaptics.c	2003-11-11 20:41:29.000000000 +0100
@@ -581,7 +581,7 @@
 
 	switch (psmouse->pktcnt) {
 	case 1:
-		if (newabs ? ((data & 0xC8) != 0x80) : ((data & 0xC0) != 0xC0)) {
+		if (newabs ? ((data & 0xC0) != 0x80) : ((data & 0xC0) != 0xC0)) {
 			printk(KERN_WARNING "Synaptics driver lost sync at 1st byte\n");
 			goto bad_sync;
 		}
@@ -593,7 +593,7 @@
 		}
 		break;
 	case 4:
-		if (newabs ? ((data & 0xC8) != 0xC0) : ((data & 0xC0) != 0x80)) {
+		if (newabs ? ((data & 0xC0) != 0xC0) : ((data & 0xC0) != 0x80)) {
 			printk(KERN_WARNING "Synaptics driver lost sync at 4th byte\n");
 			goto bad_sync;
 		}

-- 
Peter Osterlund - petero2@xxxxxxxxx
http://w1.894.telia.com/~u89404340
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/